Millstone-driver



(No Model.)

-J. F. CALLAHAN. MILLSTONE DRIVER.

No. 271,572. Patented Jan. 30, 188.3.

- IN VEN TOP,

UNITED STATES PATENT ()FFICE.

JAMES F. OALLAHAN, OF KNOXVILLE, TENNESSEE.

MlLLSTONE-DRIVER.

SPECIFICATION forming part of Letters Patent No. 271,572, dated January 30, 1883,

Application filed June 14, 1882. (No model.) i

To all whom it may concern Be it known that I, JAMES F. CALLAHAN, of Knoxville, in the county of Knox and State of Tennessee, have invented a new Improved Millstone-Driver, of which the following is a full, clear, and exact description.

The object of my invention is to insure a steady and uniform rotation of the millstoue and prevent irregularities in the movements of the motor from affecting the movements of the millstone; and to this end the invention consists in the peculiar construction and arrangement of parts, as hereinafter fully (lescribed, and pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the figures.

Figure l is a cross-sectional elevation of a millstone combined with my improved driver. Fig. 2 is. a plan view of the under side of the upper removable cap and arms of my improved millstone-driver. Fig. 3 is a plan view of the collar or annular flange on the spindle for supporting the removable cap and arm.

The vertical spindle A is provided with a collar or annular flange, B, provided on its upper side with two opposite vertical projections, 0, having radial ends, the length of each pro jection 0 being somewhat less than a quartercircle, as shown in Fig. 3. Rubber cushionblocks D D are placed on the top of the collar B and against the radial or beveled ends of the projections O. In place of the rubber blocks D D, any other suitable cushions or springs may be used. The cushions D are preferably made larger than the cushions D, and the larger cushions, D, are placed opposite to each other, as are also the smaller cushions, D. A cap, E, provided in its top with an aperture, F, through whichthe upper part of the spindle A A can pass, is adapted to rest on the collar or flange B and to inclose theblocks or projections (J on the collar B. This cap E is provided with two arms, Gr, projecting in opposite directions, the inner ends, H, of these arms being beveled and projecting into the cap E from the sides of the same, so that when the cap E rests on the collar B the beveled ends H of the arms G will be between the cushionblocks D D, as indicated in dotted lines in Fig.3. Rubber blocks J or cushions or springs are contained in recesses in the ends of the up per surfaces of the arms Gr, these cushions J being provided to prevent the millstoneK from injuring or breaking these arms Gr when the stone rocks, and to prevent undue rocking of .the stone. The millstoneKis supported from the top of the spindle by means of the balancerynd Lin the usual manner. The arms Gr pass into recesses M in the stone K, which recesses are adapted to receive these arms.

The operation is as follows: If the spindle A is rotated in the direction of the arrow a, the cushions D will press against the sides of the beveled or wedgeshaped ends H .of the arms G, and the box or cap E will be rotated in the direction of the arrow 0.. The armsGr press against the sides of the recesses M on the stone K, and thus rotate the stone in the direction of the arrow a. The stone is not connected directly with the spindle, and all the irregularities of the movement of the spindle are taken up by the cushions or springs D, and thus prevent irregular or unsteady movements of the stone. The back lash or reaction of the stone is taken up by the smaller cushions or springs, D. If the stone is rocked by the rapid movement of the spindle, the tops of the recesses M strike on the cushions J on the arms G, and thus limit-the rocking movement of the-stone.

Having thus described myinvention, I claim as new and desire to secure by Letters Patent- 1. In a millstone-driver, the combination, with the spindle A, provided with a collar or annular flange, B, having projections O, with radial or beveled ends, of the springs or cushions D D, and the cap or box E, provided with opposite arms Gr, having inner beveled ends, H, substantially as herein shown and described, and for the purpose set forth.

2. In a millstone-driver, the combination, with the spindle A, provided with a collar or annular flange, B, of the springs or cushions D D, and the box or cap E, provided with opposite arms Gr, having inner beveled ends, H, and of the springs or cushions J J on these arms, substantially as herein shown and described, and for the purpose set forth.

, JAMES F. GALLAHAN.

Witnesses:

BENJAMIN F. CALLAHAN, FRANK A. Mosns. 

